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In both Firefox and Internet Explorer setting an event handler IDL attribute also sets the content attribute so setting an event handler IDL attribute and then removing the corresponding content attribute will remove the corresponding event handler. Opera thinks this makes sense and would like to align. Can we align the specification too? (Since this is a follow up to bug 7626 I added the same people to the cc list.)
http://software.hixie.ch/utilities/js/live-dom-viewer/saved/249 suggests that Firefox doesn't do what you describe. In general, as discussed on IRC, this sounds like a big can of worms with a lot of edge cases. I think this needs a much more clear proposal.
I'm a bit confused Ian - wouldn't this: http://software.hixie.ch/utilities/js/live-dom-viewer/saved/251 be a better test for what the bug is about? :) I agree that browsers don't currently sync this. From a QA/web author perspective we think it would seem more consistent if they did. (Have not discussed this in-depth with implementors)
Sorry, my assertion was indeed based on inaccurate tests. While I agree with Hallvord that it would be nicer I don't think it's worth it to introduce this behavior.